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马晓楠,安新正,张冰,牛薇.粉煤灰取代率对再生混凝土断裂性能影响试验研究[J].河北工程大学自然版,2018,35(4):25-29
粉煤灰取代率对再生混凝土断裂性能影响试验研究
Experimental study on influence of fly ash on fracture toughness of recycled concrete
投稿时间:2018-07-21  
DOI:10.3969/j.issn.1673-9469.2018.04.006
中文关键词:  富含砖粒再生混凝土  粉煤灰取代率  断裂韧度
英文关键词:brick-rich recycled concrete  fly ash replacement rate  fracture toughness
基金项目:河北省自然科学基金资助项目(E2015204111);河北省科学技术研究与发展计划资助项目(15273609D)
作者单位
马晓楠 河北工程大学 土木工程学院, 河北 邯郸 056038 
安新正 河北工程大学 土木工程学院, 河北 邯郸 056038 
张冰 河北工程大学 土木工程学院, 河北 邯郸 056038 
牛薇 河北工程大学 土木工程学院, 河北 邯郸 056038 
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中文摘要:
      为了研究不同粉煤灰取代率对富含砖粒再生混凝土断裂性能的影响,以RC25为基准再生混凝土,并以粉煤灰取代率为0%、10%、20%、30%为变化参数,制作了四组尺寸为100 mm×100 mm×515 mm的富含砖粒再生混凝土三点弯曲梁试件。通过三点弯曲梁的断裂韧度试验,研究了富含砖粒再生混凝土随粉煤灰取代率的变化规律。结果表明:当粉煤灰取代率为10%时,富含砖粒再生混凝土的起裂韧度和失稳韧度提高幅度分别为4.61%和7.44%,当粉煤灰取代率超过10%后,随着粉煤灰取代率的增加,断裂韧度逐渐减小,最大降幅为12.21%。给出了富含砖粒再生混凝土的双K断裂韧度与粉煤灰取代率的关系式。
英文摘要:
      In order to study the effect of different fly ash replacement ratio on the fracture performance of brick-rich recycled concrete,four sets of brick-recycled concrete three-point bending beam specimens with dimensions of 100mm×100mm×515mm were produced. Recycled concrete was based on RC25, and the replacement ratio of fly ash was 0%,10%,20% and 30%.. Through the fracture toughness test of three-point bending beam,the variation law of the replacement rate of brick-rich recycled concrete with fly ash was studied. The results show that when the replacement ratio of fly ash is 10%,the increase of cracking toughness and instability toughness of brick-rich recycled concrete is 4.61% and 7.44%, respectively. When the replacement rate of fly ash exceeds 10%, with the increase of the replacement rate of fly ash,the fracture toughness decreases gradually,and the reduction maximum is 12.21%. The relationship between double K fracture toughness and fly ash replacement ratio of brick-rich recycled concrete is given.
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